It’s a fiddle but comes up ok with some patience
That could dissipate the heat from the sun 
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@JonathanC
All my builds are full of regrets.
I put my heatsink at the back because I was following a copy of a previous build blindly, and mid build I realised, but of course I cut the cable to the motor too short for the front, and the ESC was too big for the side. I could have extended the motor cable, but was over all the self created bad luck.
Based on logging it still runs cool, but I haven’t done a really hot day yet.
Your heatsink looks great and in the perfect spot.
I use both straps and locking tape to secure my two boxes, yes there are two battery boxes, and I hit a mud bank real fast once and the straps stopped the boxes from flying off the board.
Hey ZedMan, don’t be too hard on yourself, it’s a bit of a journey! I’ve done a lot of builds for myself and friends, at least 20 so had some practice. Esc’s, vesc’s 6S, 8S, 10 and 12S, pick up little improvements and skills along the way. Being with a group of buddies all on systems I’ve made is a pretty amazing experience. Keep at it and enjoy the ride 